If you are referring to the vacuum advanced, there are Corvette reproduction and some have the same usage number. I bought one from LI Corvettes for my '67 L35 and it looks and fits exact. The only exception is the number 1 in the code is slightly different (top tail in 1 . vs. straight l ) . I'm not into judging and the number is not easily visible so I went with spending the $45 for it.